Improved finite-size key rates for discrete-modulated continuous variable quantum key distribution under coherent attacks
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866909488807673856 |
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| author | Pascual-García, Carlos Bäuml, Stefan Araújo, Mateus Liss, Rotem Acín, Antonio |
| author_facet | Pascual-García, Carlos Bäuml, Stefan Araújo, Mateus Liss, Rotem Acín, Antonio |
| contents | Continuous variable quantum key distribution (CVQKD) with discrete modulation combines advantages of CVQKD, such as the implementability using readily available technologies, with advantages of discrete variable quantum key distribution, such as easier error correction procedures. We consider a prepare-and-measure CVQKD protocol, where Alice chooses from a set of four coherent states and Bob performs a heterodyne measurement, the result of which is discretised in both key and test rounds. We provide a security proof against coherent attacks in the finite-size regime, and compute the achievable key rate. To this end, we employ the generalised entropy accumulation theorem, as well as recent advances in conic optimisation, yielding improved key rates compared to previous works. At metropolitan distances, our method can provide positive key rates for the order of $10^8$ rounds. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_03087 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Improved finite-size key rates for discrete-modulated continuous variable quantum key distribution under coherent attacks Pascual-García, Carlos Bäuml, Stefan Araújo, Mateus Liss, Rotem Acín, Antonio Quantum Physics Cryptography and Security Continuous variable quantum key distribution (CVQKD) with discrete modulation combines advantages of CVQKD, such as the implementability using readily available technologies, with advantages of discrete variable quantum key distribution, such as easier error correction procedures. We consider a prepare-and-measure CVQKD protocol, where Alice chooses from a set of four coherent states and Bob performs a heterodyne measurement, the result of which is discretised in both key and test rounds. We provide a security proof against coherent attacks in the finite-size regime, and compute the achievable key rate. To this end, we employ the generalised entropy accumulation theorem, as well as recent advances in conic optimisation, yielding improved key rates compared to previous works. At metropolitan distances, our method can provide positive key rates for the order of $10^8$ rounds. |
| title | Improved finite-size key rates for discrete-modulated continuous variable quantum key distribution under coherent attacks |
| topic | Quantum Physics Cryptography and Security |
| url | https://arxiv.org/abs/2407.03087 |